scholarly journals About modeling the waves scattering on the complex shape objects

2018 ◽  
Keyword(s):  
Electromagnetic Scattering ◽  
English Language ◽  
Complex Shape ◽  
Geometric Model ◽  
Main Method ◽  
Triangular Plate ◽  
Sbr Method ◽  
Time Required ◽  
The Waves ◽  
Facet Size

Background: Reducing the detection probability by radar stations for military or civil complex shape objects is very important problem of modern radar theory. The solution to this problem is impossible without numerous estimates of the effective scattering surface (RCS) of the investigated object. Objectives: The purpose of the work was to analyze and improve the efficiency of methods for modeling electromagnetic scattering on objects of complex shape. The process of constructing a facet model of an complex shape object for modeling electromagnetic scattering and an algorithm to simplify the geometric model of an object to reduce the time required for modeling is considered. Materials and methods: As the main method for calculating the RCS, we chose the method of rays that fall and reflect (in the English language literature “Shooting and Bouncing Rays” SBR). Wherein the modeling electromagnetic scattering on an complex shape object is based on the methods of physical and geometric optics. Object is represented in the form of a geometric model which takes into account the shape of the object and its electrodynamic properties (reflection coefficient, dielectric and magnetic permeability of the surface, conductivity, etc.). Results: The general steps of the SBR method are discussed, and the efficient of using the surface mesh method to launch the rays is shown. Effective approaches to simplify the calculation for complex shape objects are proposed, in particular, the use of Raytressing and k-d tree is considered. The using of large facets for modeling surface flat sections of complex shape object is proposed. To assess the effect of the facet size on the accuracy of RCS calculations, we simulated electromagnetic scattering for a triangular plate, the surface of which is represented using different numbers of facets. A comparison with the well-known expressions for a triangular plate RCS is made. Conclusions: The accelerating possibilities of the process of electromagnetic wave diffraction calculation on complex shape objects are offered. The efficiency of the created algorithms is tested numerically.

scholarly journals دینی مدارس میں عصری علوم اورانگریزی زبان کی تعلیم کا جائزہ

2020 ◽  
Vol 38 (- 1) ◽  
Author(s):  
Bacha Agha Syed
Keyword(s):  
Educational System ◽  
English Language ◽  
Social Economic ◽  
Pivotal Role ◽  
Academic Field ◽  
Modern Education ◽  
The People ◽  
The World ◽  
Time Required ◽  
Developed Nations

Education plays a pivotal role in the development of any nation. The Better the Education, the better would be its impacts on every walk of life of a nation. Education is responsible for the development of social, economic, cultural as well as in the development of every field of life. Therefore the development of the educational system has been the center of every concerned nation, and thought is the sign of the lives of the nations. As all the intellectual processes come from no being into being, and the required length of time needs intensity of thought, depends on the inteluctability of its existence. Education is not a matter of concern even if it is not a part of thought, and if it becomes a part of thought, the length of time required for change is not high. As the world that is developing rapidly, and the knowledge that is attained in the present age, the people who turn away from it will not be able to maintain their presence at the home page. Any healthy, developed and advanced educational system can make real the dream of building a decent and robust nation. In the coming days, nations who do not share their knowledge in the academic field will always be in behind of the developed nations and will always lose the respect and deprivation will always be their lot. This Research is going to explain the importance of modern Education and to reflect on the importance of English Language in processes of development from Islamic perspectives.

scholarly journals Language Barriers among Taiwanese National Champions

2018 ◽  
Vol 9 (1) ◽  
pp. 63
Author(s):  
Ying-Ling Chen
Keyword(s):  
English Language ◽  
Language Barriers ◽  
Structure Interview ◽  
Research Data ◽  
Language Barrier ◽  
Main Method ◽  
Interview Technique ◽  
Communication Difficulties ◽  
Semi Structure Interview ◽  
National Champions

The study investigated experiences of archery national champions regarding their use of English language at the international athlete village. The slowly growing recognition of the issue in the language barrier was discovered. Three female elite archery athletes were selected that met the criteria for national champion status was based upon previous experiences of competing in the international games. The use of semi-structure interview technique was implemented to be the main method of gathering research data. The study identified several language barriers to communication difficulties. The findings indicated language barriers become issues and had debilitating effect in communication through English language.

scholarly journals Whole – brain learning style in context to Emotional Intelligence and Cognition

2016 ◽  
Vol 2 (2) ◽  
Author(s):  
Veena Joseph
Keyword(s):  
Emotional Intelligence ◽  
Learning Style ◽  
Teaching And Learning ◽  
English Language ◽  
Target Language ◽  
Whole Body ◽  
Learning Approach ◽  
Whole Brain ◽  
English Language Acquisition ◽  
Time Required

English Language acquisition has to have a paradigm shift in teaching and learning and an engaging trend has to be incorporated. This transition may be acquired by employing near acquisition strategies. Applying Emotional Intelligence is without a doubt, complicated in terms of creating and planning the period of time required for exposure to the target language. Once it is maintained, the acquisition environment may offer individuals a more realistic atmosphere to use the target language in real like manner. The cognitive and emotive learning style is based upon whole brain thinking and learning. This pedagogical method is mapped out in Hermant’s whole – brain learning approach (1995). The greater the variety of learning strategic occur the more “intelligently” people are able to use both hemispheres of the brain to obtain optimal results during a learning course. This whole brain learning approach involves not only the whole brain but also by implication, the whole body of the learner. Hannaford (1995:87) goes further by indicating that learners build skills (and learn) as they use the muscles of their bodies, establishing neuromuscular route, as well as ties with cognitive routes, According to course (2006:233). The more we study the roles of cerebellum the more we realize that movement and learning are inescapably linked. The objective during this study is to use a creative programme to become the Centrifugal force from where the outcome, namely emotional intelligence can be energized.

Improving Rough Cutting Efficiency for Machining of Impellers

2004 ◽  
Author(s):  
Der-Min Tsay ◽  
Chien-Wen Chen
Keyword(s):  
End Milling ◽  
Geometric Model ◽  
Production Costs ◽  
Cnc Milling ◽  
Rough Machining ◽  
Tool Paths ◽  
Cnc Milling Machine ◽  
Computer Numerically Controlled ◽  
Step Interval ◽  
Time Required

A procedure that can be used to generate rough cutting tool paths with minimized variations of material removal rates (MRRs) is developed for 5-axis ball end milling of centrifugal compressor impellers. Based on the geometric model of impellers, the detailed processes in finding the cutter contact (CC) points with equal spacing for step interval between two adjacent tool paths and a constant depth between two neighboring cutting layers are presented. The developed system can considerably improve productivity and lower production costs in rough machining since the time required can be reduced by minimizing the waste tool paths. Simulation and machining tests by a 5-axis computer numerically controlled (CNC) milling machine are performed to illustrate the procedure and its advantages.

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